Which natural and human-made objects did the Robertson Panel identify as likely explanations for UFO reports?

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The Robertson Panel, convened by the Central Intelligence Agency in 1953, concluded that the vast majority of unidentified flying object reports could be attributed to commonplace natural and human-made phenomena.12

The panel identified the following as likely explanations for these sightings:

The panel determined that these sightings posed no security risk to the United States and found no evidence to support the extraterrestrial hypothesis.12